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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 356 (Engine Controls And Fuel - 3.6L (LGX) - DTC P0446 To DTC P3436 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Malfunction Indicator Lamp (MIL) Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF.
  2. Disconnect the X1 harness connector at the K20 Engine Control Module.
  3. Ignition ON, verify the MIL does not illuminate.
    • If the MIL illuminates 
    1. Test for infinite resistance between the control circuit terminal 46 and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance, replace the P16 Instrument Cluster.
    • If the MIL does not illuminate 
  4. Connect a 3 A fused jumper wire between the control circuit terminal 46 and ground.
  5. Verify the MIL illuminates.
    • If the MIL illuminates 

      Replace the K20 Engine Control Module.

    • If the MIL does not illuminate 
    1. Test for less than 1 V between the control circuit terminal 46 and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V
    2. Ignition OFF.
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω.
  6. Ignition OFF, disconnect the X1 harness connector at the instrument cluster.
  7. Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal 8 and ground.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition voltage circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If the test lamp illuminates 
  8. Replace the P16 Instrument Cluster.
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